<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>判断一个数是否为素数</title>
</head>
<body>
    <script>
        function isZhiShu(n){
            if(n<=1){
                return false;
            }
            for (let i = 2; i < n; i++) {
                if(n%i===0){
                    return false;
                }              
            }
            return true;
        }
        console.log("9:"+isZhiShu(9));
        console.log("7:"+isZhiShu(7));
    </script>
</body>
</html>